Common IBM i Operations Mistakes and Best Practices

Learning Objective

By the end of this lesson, you will be able to recognize the most common beginner mistakes across IBM i jobs, queues, locks, authorities, and library lists, and apply a simple set of best practices to avoid them.

Simple Explanation

This lesson brings together the operations concepts covered across both Operations Batches, jobs, job queues, output queues, subsystems, library lists, object locks, and authorities, into one focused list of the mistakes beginners make most often.

A few of the most common mistakes:

• Confusing a job queue with an output queue. As covered in the Job Queues and Output Queues lesson, one holds jobs waiting to run, the other holds spool files waiting to print.
• Expecting plain DSPJOBLOG to show a different job's log. As covered in the Job Logs in Batch Jobs lesson, checking a batch job's log generally means identifying it first, through WRKSBMJOB or WRKACTJOB.
• Ending a job that holds an object lock without checking what it is doing first. As covered in the Handling Object Locks as a Developer lesson, waiting or simply asking is often a better first step than ending a job outright.
• Treating an authority failure like a locking or missing-object problem. As covered in the Authority Failures and How to Investigate Them lesson, these have different causes and require different fixes.
• Assuming an object is missing when it is really a library list problem. As covered in the Library List Problems in Real Applications lesson, "not found" and "wrong version found" both often trace back to the library list rather than the object itself.

Why It Matters

Almost every beginner mistake with IBM i operations traces back to one of a small number of familiar mix-ups. Recognizing this short, repeatable list turns operations troubleshooting into a quick checklist, helping new developers resolve problems faster and with less frustration.

Practical Example

Imagine a developer convinced a file is simply missing, when the real problem is that its library is not part of their job's library list. Checking against this list quickly surfaces the likely cause: a library list problem, exactly as covered in the Library List Problems in Real Applications lesson, rather than the file having actually disappeared.

This is a simplified, illustrative example rather than a specific real review, but it reflects how useful a short, known list of common mistakes is when something on IBM i is not behaving as expected.

Common Confusions

"Are these mistakes only made by beginners?" They are most common among beginners, but even experienced developers occasionally slip up on one of these, especially the job queue versus output queue mix-up when working quickly. The value of this list is in having a quick, repeatable checklist to reach for, regardless of experience level.

"Is this the complete list of every possible IBM i operations mistake?" No. This lesson focuses on the most common mistakes connected to the beginner-level operations concepts covered across both Operations Batches. More advanced topics, such as subsystem configuration or detailed security administration, have their own separate considerations beyond this introduction.

"Which mistake on this list is most important to avoid?" All five matter, but confusing job queues and output queues is likely the most common early mix-up, since both hold something "waiting," even though what each one holds is completely different.

Quick Recap

• The most common IBM i operations mistakes are: confusing job queues with output queues, expecting DSPJOBLOG to show a different job's log by default, ending a job with a lock too hastily, confusing authority failures with locking or missing-object problems, and misdiagnosing library list problems as missing objects.
• Checking this short list first turns operations troubleshooting into a quick checklist rather than an open-ended search.
• This list focuses on the beginner-level concepts covered across both Operations Batches; more advanced topics have their own separate considerations.
• Even experienced developers occasionally make these same mistakes, which is exactly why the checklist stays useful over time.

Try Asking the AI Tutor

Use the AI Tutor to ask follow-up questions about this lesson. For example, try asking:

• "Which of these common mistakes is easiest to accidentally repeat even after learning about it once?"
• "How would I explain the job queue versus output queue mix-up to someone brand new to IBM i?"